Persona 5 Uses New Internal Engine

In an interview discussing Persona 4 The Golden and Persona 4 The Ultimate in Mayonaka, producer Katsura Hashino said that preliminary development for Persona 5 (which he referred to as "the next numbered title") is nearly complete. From here, the staff will advance into the actual development process."
(Next-Gen, Persona 5, PS3, Xbox 360)